jFlickrFeed Plugin makes it easy to pull Flickr feeds and display them on your site.
jTweetsAnywhere is a jQuery Twitter Widget with @Anywhere support that simplifies the integration of Twitter services into any website.
zTwitterFeed plugin will read Twitter tweets from a given user name. It produces structured HTML with in-built CSS classes for styling. Simple and easy to use.
FeedEk is an RSS/ATOM Feed Reader/Importer/Parser that is written with jQuery. You can obtain feeds easily from any domain.